package com.lagou.web.servlet;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SimplePropertyPreFilter;
import com.lagou.base.BaseServlet;
import com.lagou.pojo.Course;
import com.lagou.service.CourseService;
import com.lagou.service.impl.CourseServiceImpl;
import com.lagou.utils.DateUtils;

import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;
import java.util.Map;

@WebServlet("/course")
public class CourseServlet extends BaseServlet {

    //查询课程信息列表
    public void findCourseList(HttpServletRequest request, HttpServletResponse response) {

        try {
            //1.接收参数

            //2.业务处理
            CourseServiceImpl courseService = new CourseServiceImpl();
            List<Course> courseList = courseService.findCourseList();

            //3.响应结果

            //SimplePropertyPreFilter 指定要转换的JSON字段
            SimplePropertyPreFilter filter = new SimplePropertyPreFilter(Course.class, "id", "course_name", "price", "sort_num", "status");

            String result = JSON.toJSONString(courseList, filter);
            response.getWriter().print(result);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void findByCourseNameAndStatus(HttpServletRequest request, HttpServletResponse response) {

        try {
            //1.接收参数
            String course_name = request.getParameter("course_name");
            String status = request.getParameter("status");

            //2.调用业务处理
            CourseService cs = new CourseServiceImpl();
            List<Course> courseList = cs.findByCourSeNameAndStatus(course_name, status);

            //3.返回结果
            SimplePropertyPreFilter filter = new SimplePropertyPreFilter(Course.class, "id", "course_name", "price", "sort_num", "status");

            String result = JSON.toJSONString(courseList, filter);

            response.getWriter().print(result);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //根据课程id 查询课程信息
    public void findCourseById(HttpServletRequest request, HttpServletResponse response) {

        try {
            //1.接收参数
            String id = request.getParameter("id");
            //2.业务处理
            CourseService cs = new CourseServiceImpl();
            Course course = cs.findCourseById(Integer.parseInt(id));

            //3.返回结果
            SimplePropertyPreFilter filter = new SimplePropertyPreFilter(Course.class, "id", "course_name", "brief", "teacher_name",
                    "teacher_info", "price", "price_tag", "discounts", "preview_first_field", "preview_second_field", "course_img_url", "share_title",
                    "share_description", "course_description", "share_image_title");
            String result = JSON.toJSONString(course, filter);
            response.getWriter().print(result);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //修改课程状态
    public void updateCourseStatus(HttpServletRequest request, HttpServletResponse response) {

        try {
            //1.获取参数
            String id = request.getParameter("id");
            //2.业务处理
            CourseService cs = new CourseServiceImpl();
            //3.根据课程的id 查询课程信息
            Course course = cs.findCourseById(Integer.parseInt(id));

            //4.判断课程状态信息，进行取反
            int status = course.getStatus();
            if (status == 0) {
                //如果是0那么设置为1
                course.setStatus(1);
            } else {
                course.setStatus(0);
            }
            //5.设置更新时间
            course.setUpdate_time(DateUtils.getDateFormart());

            //6.修改状态
            Map<String, Integer> map = cs.updateCourseStatus(course);

            //7.响应结果
            String s = JSON.toJSONString(map);

            response.getWriter().print(s);
        } catch (IOException e) {
            e.printStackTrace();
        }


    }
}
